EKG chapter 1 41 questions
Weight of a males heart
10-12oz
Weight of a females heart
8-10oz
The largest blood vessel in body is an artery called the --?
aorta
What controls the systemic blood flow and determines total peripheral resistance
arterioles
Within the four heart chambers, ---- the is/are upper or superior right and left chambers.
atria
When the SA node is not working correctly, the heart has a backup pacemaker called the
atrioventricular (AV) node
Plays important role of exchanging oxygen & nutrients/waste for the other vessels to transport
capillaries
Which of the following are very thin and fragile blood vessels
capillaries
All heart valves should open and close completely once each
cardiac cycle
What do intercalated discs allow
cardiac muscle to create synchronized contractions
Cardio myocytes consist of cardiac working cells responsible for
contractions
cardiac working cells are responsible for
contractions
Most of the veins of the heart muscle drain into which of the following vessels?
coronary sinus
Endothelial Cells are
densely packed, flat, irregular, noted at being squamous cells
Veins carry what type of blood to heart so the cycle can repeat
deoxygenated
cardiac pacemaker cells are responsible for
electric impulses
The process of creating a(n) only occur in the pacemaker cells can
electrical impulse
What type of tissue is the smooth outer layer of heart wall where coronary arteries are located
epicardium
provide protection from microbial invasions, selective absorption &transcellular transportation
epithelial cells
Squamous cells means
formation plate-like or consisting of cells
Vein located in the heart that begins along the anterior ventricles in the apex of the heart
great coronary
The largest part of the human heart is composed of four hollow cavities referred to as the
heart chambers
cardiomyocytes are
heart muscle cells
Which vein drains deoxygenated blood from the body below the heart into the right atrium?
inferior vena cava
ventricles are
lower or inferior right and left chambers
pericardial fluid acts as a
lubricant
What is returned to the heart via several major veins?
metabolic waste
Blood should never what in the 4 chambers
mix together
What function does smooth muscle cells do in the heart
move and control fluids through blood vessels
smooth muscle cells function
moving and controlling fluids through blood cells
Septum is
muscular membrane separates heart chambers into right and left sides
The middle layer of the heart wall is composed of what type of tissue
myocardium
Tissue that is thicker in the ventricles than it is in the atrium
myocardium
What type of heart tissue is responsible for the heart contractions?
myocardium
heart valves do what
open and close completely once each cardiac cycle
The process of creating an electrical impulse can only occur in what type of
pacemaker
What muscles hold the tricuspid, and mitral valves What muscles hold the tricuspid, & mitral valves in place along the ventricle walls
papillary
Which of following contains tough inelastic outer surface known as parietal pericardium
pericardial sac
The heart is surrounded by a protective fibrous membrane called the
pericardium
What is the purpose of the heart septa wall
prevent blood from mixing
What artery carries deoxygenated blood to the lungs from the right ventricle?
pulmonary
Valve closed holds blood rt vent til contraction opens valve & allows blood pumped into lungs
pulmonic
What valve, when closed, holds blood in right ventricle and allows blood to be pumped to lungs
pulmonic
What muscular membrane separates heart chambers medially into right and left sides?
septum
What type of circulation is blood flow to the entire body except the lungs
systemic
What is total peripheral resistance determined by
systemic circulation
Atria is the
upper or superior right and left chambers
Which of the following decreases blood flow and heart rate
vasoconstriction
BP, vascular resistance & body temp are decreased & blood flow & heart rate are increased in
vasodilatation
